Fake Shemp, or simply Shemp, is someone who appears in a film as a replacement for another actor or person. Their appearance is disguised using methods such as heavy make-up (or a computer-generated equivalent), filming from the back, or using partial shots of the actor.
The term references the comedy trio The Three Stooges. On November 22, 1955, Stooge Shemp Howard died suddenly of a heart attack at age 60. At the time, the Stooges still had four shorts left to deliver (Rumpus in the Harem, Hot Stuff, Scheming Schemers, and Commotion on the Ocean), by the terms of their annual contract with Columbia Pictures. By this point in the trio's career, budget cuts at Columbia had forced them to make heavy use of from previously completed shorts anyway, so they were able to complete the films without Shemp. New footage was filmed of the other two Stooges (Moe Howard and Larry Fine) and edited together with stock footage. When continuity required that Shemp appear in these new scenes, they used Columbia supporting player Joe Palma to be a body double for him, often appearing only from behind or with an object obscuring his face. Palma is often mistakenly cited as Shemp's stand-in, but these four shorts are the only documented times he performed in this capacity. Joe Palma was a bit character actor and was not employed as a stand-in or double during Shemp's lifetime. Shemp's stand-in was usually Harold Breen, and there were others from time to time. But these four shorts required someone to double as Shemp in an actor's capacity, not a stand-in per se; hence, Jules White utilized character actor Palma. Palma became the original "Fake Shemp", although the term was not officially in use at the time.
For Rumpus in the Harem, Palma is seen from the back several times. The first time occurs in the restaurant when Moe declares that the trio must do something to help their sweethearts. Larry then concludes the conversation by saying "I've got it, I've got it!" Moe inquires with "What?" Larry replies, "a terrific headache!" Later, Palma is seen from the back being chased in circles by the palace guard. A few lines of dialogue appear — "Whoa, Moe, Larry! Moe, help!" — by dubbing Shemp's voice from the soundtracks of Fuelin' Around and Blunder Boys. Palma was later seen from the side when staring up at the Harem girls (they allowed half his face to be shown because he was farther from the camera than Moe or Larry).